Please select and order
€56.10
excl. VAT
Add to cart
Norm

ISO 7873:1993

Issue date: 1993 12 23

Control charts for arithmetic average with warning limits

Specifies procedures for the statistical control of processes by using control charts based on calculating the arithmetic average of a sample and using warning limits and...
Withdrawn: 2014 12 10
Publisher:
International Organization for Standardization
Format:
Digital | 13 Pages
Language:
English

Specifies procedures for the statistical control of processes by using control charts based on calculating the arithmetic average of a sample and using warning limits and action limits. It is assumed that for large lots and for the mass output of piece and batch production, such a measure of quality is a random variable following a normal distribution. However, when averages of four or more items are plotted, this assumption of a normal distribution is not necessary for control purposes.